三相泡沫体系堵水效果及影响因素实验研究

摘要/Abstract

摘要：

纳米颗粒作为新型稳泡材料,能够显著提高泡沫稳定性,其研究和应用受到石油科技工作者的广泛重视。针对渤海油田堵水技术需求,以物理化学、高分子材料学和油藏工程等为理论指导,以仪器检测、化学分析和物理模拟等为技术手段,以渤海典型油藏地质特征和流体为研究对象,开展了纳米颗粒氮气三相泡沫体系基本性能评价和堵水效果物理模拟研究。结果表明,当起泡剂（PO-FASD）和稳泡剂（SiO₂纳米颗粒AEROSIL380）浓度为0.3 %左右时,起泡剂和稳泡剂水溶液与氮气可以形成性能优良的三相泡沫体系。随储层渗透率级差增加,水驱开发效果变差,泡沫堵水增油效果提高。随水驱采出程度增加,泡沫堵水增油效果提高。随原油黏度增加,泡沫堵水增油效果变差。由此可见,三相泡沫体系具有良好封堵和液流转向能力,尤其适合于高含水油藏高渗透层堵水施工。

关键词: 渤海油藏, 三相泡沫, 纳米颗粒, 堵水, 物理模拟

Abstract:

As a new type of foam stabilizing material, nano-particles can significantly improve the stability of foam. The research and application of nano-particles have been paid much attention by petroleum researchers. Considering the demand of water plugging technology in Bohai Oilfield, and guided by the theory of physical chemistry, polymer materials and reservoir engineering, we studied the evaluation of basic performance and the physical simulation of water plugging effect of nano-particle nitrogen foam system according to the geological characteristics and fluids of typical reservoirs in Bohai by technical means such as instrument detection, chemical analysis and physical simulation. The results showed that when the concentration of foaming agent（PO-FASD） and stabilizer（SiO₂ nano-particle AEROSIL380） were about 0.3 %, the foaming agent and foam stabilizer could form the three phase foam system with nitrogen in excellent performance. With the increase of the reservoir permeability gradation, the effect of water flooding development got worse, and the effect of foam plugging and increasing oil increased. While with the increase of the water flooding recovery, the effects of foam plugging and oil increasing effect were improved. However, if the viscosity of crude oil increased, the effects of foam plugging and oil increasing effect would get worse. Thus, we could find that the three-phase foam system has good plugging and liquid flow steering ability, especially suitable for high water cut reservoir high permeability layer water plugging.

Key words: Bohai oilfield, three phase foam, nano-particles, water plugging, physical simulation

中图分类号:

TE357

张云宝,徐国瑞,邹剑,王楠,贾永康,葛嵩,刘进祥. 三相泡沫体系堵水效果及影响因素实验研究[J]. 油气藏评价与开发, 2019, 9(2): 44-49.

Zhang Yunbao,Xu Guorui,Zou Jian,Wang Nan,Jia Yongkang,Ge Song,Liu Jinxiang. Experimental study on water plugging effect and influence factors of three phase foam system[J]. Reservoir Evaluation and Development, 2019, 9(2): 44-49.

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参考文献 24

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离子组成和含量							总矿化度
K⁺+Na⁺	Ca²⁺	Mg²⁺	Cl^-	SO₄^2-	CO₃^2-	HCO₃^-	总矿化度
2 758.3	627.7	249.4	6 313.3	91.4	0.0	166.5	10 206.5

起泡剂, %	起泡体积/mL	泡沫半衰期/min	析液半衰期/ s	泡沫综合指数/ （min·mL）
0.05	185	2	51	370
0.1	250	4	198	1 000
0.2	430	8	259	3 440
0.3	480	15	309	7 200
0.4	485	16	340	7 760
0.5	495	25	384	12 375

起泡剂, %	起泡体积/mL	泡沫半衰期/min	析液半衰期/ s	泡沫综合指数/（min·mL）
0.05	445	42	478	18 690
0.1	435	48	488	20 880
0.2	450	55	510	24 750
0.3	465	61	503	28 365
0.4	425	67	407	28 475
0.5	410	72	425	29 520

方案编号	小层渗透率K_g/ 10^-3μm²		含油饱和度, %	采收率,%
方案编号	小层渗透率K_g/ 10^-3μm²		含油饱和度, %	水驱	堵水	增幅
方案1-1	高渗层	7 302	77.63	65.11	65.77	0.66
	低渗层	499	65.80	4.52	51.61	47.09
	整体		72.98	43.63	60.75	17.12
方案1-2	高渗层	4 986	76.54	61.60	62.60	1.00
	低渗层	506	61.44	16.04	55.60	39.56
	整体		70.68	45.67	60.14	14.48
方案1-3	高渗层	2 516	75.35	58.17	61.98	3.81
	低渗层	494	64.74	37.06	62.50	25.44
	整体		70.62	49.54	62.19	12.65

方案编号	小层渗透率K_g/ 10^-3μm²		水驱程度, %	含油饱和度, %	采收率,%
方案编号	小层渗透率K_g/ 10^-3μm²		水驱程度, %	含油饱和度, %	水驱	堵水	增幅
方案2-1	高渗层	4 895	40	74.08	42.94	57.13	14.19
	低渗层	485		60.03	2.09	12.98	10.89
	整体			68.43	28.54	41.57	13.03
方案2-2	高渗层	4 717	90	75.17	54.84	60.16	5.33
	低渗层	502		59.83	3.86	37.27	33.41
	整体			68.87	36.64	51.99	15.35
方案2-3	高渗层	4 986	98	76.54	61.60	62.60	1.00
	低渗层	506		61.44	16.04	55.60	39.56
	整体			70.48	45.67	60.14	14.48